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btrfs-progs: fix cross stripe boundary check 

Commit 854437ca3c ("btrfs-progs:
extent-tree: avoid allocating tree block that crosses stripe boundary")
does not work for 64k nodesize. Due to an off-by-one error, all queries
to check_crossing_stripes will return that all extents cross a stripe
and this will lead to a false ENOSPC. This crashes later

$ ./mkfs.btrfs -n 64k image

./mkfs.btrfs(btrfs_reserve_extent+0xb77)[0x417f38]
./mkfs.btrfs(btrfs_alloc_free_block+0x57)[0x417fe0]
./mkfs.btrfs(__btrfs_cow_block+0x163)[0x408eb7]
./mkfs.btrfs(btrfs_cow_block+0xd0)[0x4097c4]
./mkfs.btrfs(btrfs_search_slot+0x16f)[0x40be4d]
./mkfs.btrfs(btrfs_insert_empty_items+0xc0)[0x40d5f9]
./mkfs.btrfs(btrfs_insert_item+0x99)[0x40da5f]
./mkfs.btrfs(btrfs_make_block_group+0x4d)[0x41705c]
./mkfs.btrfs(main+0xeef)[0x434b56]

Holger Hoffstätte reports that this also fixes false positives in case
the nodesize is less than 64k. This happens when the node blocks end at
the stripe boundary.

Reviewed-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2015-09-10 16:36:04 +02:00
parent 81a58518d4
commit 73a894e51e
1 changed files with 1 additions and 1 deletions
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2
volumes.h
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@ -156,7 +156,7 @@ struct map_lookup {
static inline int check_crossing_stripes(u64 start, u64 len)
{
return (start / BTRFS_STRIPE_LEN) !=
((start + len) / BTRFS_STRIPE_LEN);
((start + len - 1) / BTRFS_STRIPE_LEN);
}
int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,